Has anyone experimented with Jumbo Packets, and it's impact on TSM?  We
are putting some money in the budget next year to get a switch and try
it, I was just wondering if anyone already knows.  Thanks.


Andy Carlson                                    |\      _,,,---,,_
Senior Technical Specialist               ZZZzz /,`.-'`'    -.  ;-;;,_
BJC Health Care                                |,4-  ) )-,_. ,\ (  `'-'
St. Louis, Missouri                           '---''(_/--'  `-'\_)
Cat Pics: http://andyc.dyndns.org/animal.html


On Wed, 24 Jul 2002, Zlatko Krastev wrote:

> For sure numbers are not good. In customer environment we have achieved
> 12-13MB/s average (with peaks of 25 MB/s) when using TSM client
> compression and 60-70 MB/s without compression. These are real numbers
> with TSM client and server and measured with topas and monitor. Yes, the
> customer has EMC Symmetrix on the node and diskpool on IBM ESS but the
> network might be pumped very good.
>
> Zlatko Krastev
> IT Consultant
>
>
>
>
> Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> Sent by:        "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> To:     ADSM-L AT VM.MARIST DOT EDU
> cc:
>
> Subject:        Gigabit Ethernet Performance
>
> Hi TSM-ers,
>
> our newly installed Gigabit Ethernet seems to have some performance
> problems.
> When I do the following FTP command between two UNIX (AIX) machines I only
> get about 8Megabyte per second.
>
> # ftp 10.135.11.55
> Name: adminrt
> Password:
> ftp> put "|dd if=/dev/zero bs=32k count=10000" /dev/null
> 200 PORT command successful.
> 150 Opening data connection for /dev/null.
> 10000+0 records in.
> 10000+0 records out.
> 226 Transfer complete.
> 327680000 bytes sent in 39.5 seconds (8102 Kbytes/s)
> local: |dd if=/dev/zero bs=32k count=10000 remote: /dev/null
>
> This command transfers data from nowhere to nowhere so no disk
> is involved. The performance numbers only include network, network
> adapter,
> TCP/IP and a bit of UNIX.
> Do you think 8MB/s is OK for Gigabit Ethernet?
> Would anyone be so kind and test this command in their own UNIX
> environment
> and tell me the numbers?
>
> Thanks in advance and greetings from Austria
> Thomas Rupp
> Vorarlberger Illwerke AG
> MAIL:   thomas.rupp AT illwerke DOT at
> TEL:    ++43/5574/4991-251
> FAX:    ++43/5574/4991-820-8251
>
>
>
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